6L80 6L90 8L90 Sure Cool System Upgrade STL010

I was running 200-220F hot summer temps (Florida) when I bought my 2018 5.3L Suburban high-mileage used in 2021. I did see a reduction into typical 190s temps, maybe breaking 200 on hot days with a lot of shifting, after doing a fluid evac and replacement. But this device is the REAL DEAL that dropped my temps. I can't get the thing to go over 170F NO MATTER WHAT I DO.Now, because the fluid is running through the cooler CONSTANTLY, it only gets anywhere above 155F if I'm sitting in traffic on a hot day and moving slowly without much air reaching the trans cooler. But as soon as I'm back up to speed, especially highway speeds, the temps start dropping and it's not unusual to cruise at just below 150F on the highway with good air flow.I am 100% certain I have just saved, or at least prolonged, the life of my torque converter. If you have a 6L80 this is as important a thing as you can do for it, and it only takes half an hour with extremely basic tools. Most complicated thing you need is snap-ring pliers that squeeze together (not the one that expands).This is every bit as important with these trucks as an AFM disabler to preserve your lifters, and, frankly, this is a more certain fix than the AFM disabler offers. GM has acknowledged that 190-220F is way too hot for your torque converter in a TSB release, but their "fix" is another thermostat that can freeze shut. This fix allows flow even if everything inside the device fails - the default is open flow to the cooler and worst case, in very cold climate in winter, you might need an extra couple minutes of morning warmup. In most of the country, you just leave it so that it's always open - the check-ball lets it clear out any overpressure from one side or the other so there's no harm that can occur.Just a BRILLIANT solution!!!BTW, my PHOTO shows the HIGHEST TEMP I have been able to reach since installing, and driving in warm weather - average daytime outdoor temp here is 80F. To get it up to 169F as shown in photo I had to run it at high revs in 1st gear in stop-and-go city traffic on a blistering day. That's the max I can get it up to now, and it takes a lot of trying! As soon as I hit the highway, or just 45mph in the city, that temp backs down into the 150s quickly.

I am no mechanic by far. But I knew my transmission on my 2016 Sierra 1500 5.3, was getting hot. I recently got my truck. I noticed the transmission was getting to temperatures exceeding 195-200. I watched a few videos on how to install this product. Very easy, very simple. Even came with instructions. I HIGHLY recommend. My transmission is now not exceeding 160 on a hot day at 90°. I reside in FL BTW. Anyways, if your second guessing, dont. This device is awesome!

Easier than I thought. Spent more time getting truck on ramps and jack stands than installing kit. Probably lost maybe a cup of fluid at most. Hard to check hot fluid level now because temp needs to be above 160 to do that. Pulled a rv trailer around and still didn’t get there but hey, who cares, it’s works and I’m sure level is fine

A must for the 6L90E my temps was well over 190 degrees now average 160 unloaded, nice well built kit easy to install

This thing works wonders for your truck any truck with a 8l90e should buy this for sure

Works great. Will help with your transmission over heating and transmission shutter. Throw in some shutter stop and my problem was fixed. Saved me $2500. If you catch your transmission starting to shutter or over heat, you need this. If you pull trailers, it's a must have. I have installed these on 3 trucks already.

Trabaja muy bien

It works plain and simple. My transmission was running at 195* daily. I installed this bypass and ran my truck all day. It never went above 160*. That included city stop and go, idling and highway driving. It was very easy to install and it only took me 20-25 minutes. I lost very little fluid during the process.